logstash service improvements

* add logstash-contrib plugins package
* add additional options to the logstash service

nixos/modules/services/logging/logstash.nix

@@ -4,6 +4,9 @@ with lib;
 
 let
   cfg = config.services.logstash;
+  pluginPath = lib.concatStringsSep ":" cfg.plugins;
+  havePluginPath = lib.length cfg.plugins > 0;
+  ops = lib.optionalString;
 
 in
 
@@ -20,12 +23,50 @@ in
         description = "Enable logstash.";
       };
 
+      package = mkOption {
+        type = types.package;
+        default = pkgs.logstash;
+        example = literalExample "pkgs.logstash";
+        description = "Logstash package to use.";
+      };
+
+      plugins = mkOption {
+        type = types.listOf types.path;
+        default = [ ];
+        example = literalExample "[ pkgs.logstash-contrib ]";
+        description = "The paths to find other logstash plugins in.";
+      };
+
+      watchdogTimeout = mkOption {
+        type = types.int;
+        default = 10;
+        description = "Set watchdog timeout value in seconds.";
+      };
+
+      filterWorkers = mkOption {
+        type = types.int;
+        default = 1;
+        description = "The quantity of filter workers to run.";
+      };
+
       enableWeb = mkOption {
         type = types.bool;
         default = false;
         description = "Enable the logstash web interface.";
       };
 
+      address = mkOption {
+        type = types.str;
+        default = "0.0.0.0";
+        description = "Address on which to start webserver.";
+      };
+
+      port = mkOption {
+        type = types.str;
+        default = "9292";
+        description = "Port on which to start webserver.";
+      };
+
       inputConfig = mkOption {
         type = types.lines;
         default = ''stdin { type => "example" }'';
@@ -79,7 +120,12 @@ in
       wantedBy = [ "multi-user.target" ];
       environment = { JAVA_HOME = jre; };
       serviceConfig = {
-        ExecStart = "${logstash}/bin/logstash agent -f ${writeText "logstash.conf" ''
+        ExecStart =
+          "${cfg.package}/bin/logstash agent " +
+          "-w ${toString cfg.filterWorkers} " +
+          ops havePluginPath "--pluginpath ${pluginPath} " +
+          "--watchdog-timeout ${toString cfg.watchdogTimeout} " +
+          "-f ${writeText "logstash.conf" ''
             input {
               ${cfg.inputConfig}
             }
@@ -91,7 +137,8 @@ in
             output {
               ${cfg.outputConfig}
             }
-        ''} ${optionalString cfg.enableWeb "-- web"}";
+          ''} " +
+          ops cfg.enableWeb "-- web -a ${cfg.address} -p ${cfg.port}";
       };
     };
   };

pkgs/tools/misc/logstash/contrib.nix

@@ -0,0 +1,31 @@
+{ stdenv, lib, fetchzip }:
+
+# Note that plugins are supposed to be installed as:
+#   $path/logstash/{inputs,codecs,filters,outputs}/*.rb 
+stdenv.mkDerivation rec {
+  version = "1.4.2";
+  name = "logstash-contrib-${version}";
+
+  src = fetchzip {
+   url = "http://download.elasticsearch.org/logstash/logstash/logstash-contrib-${version}.tar.gz";
+   sha256 = "1yj8sf3b526gixh3c6zhgkfpg4f0c72p1lzhfhdx8b3lw7zjkj0k";
+  };
+
+  dontBuild    = true;
+  dontPatchELF = true;
+  dontStrip    = true;
+  dontPatchShebangs = true;
+
+  installPhase = ''
+    mkdir -p $out/logstash
+    cp -r lib/* $out
+  '';
+
+  meta = with lib; {
+    description = "Community-maintained logstash plugins";
+    homepage    = https://github.com/elasticsearch/logstash-contrib;
+    license     = stdenv.lib.licenses.asl20;
+    platforms   = stdenv.lib.platforms.unix;
+    maintainers = with maintainers; [ cstrahan ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1494,6 +1494,8 @@ let
 
   logstash = callPackage ../tools/misc/logstash { };
 
+  logstash-contrib = callPackage ../tools/misc/logstash/contrib.nix { };
+
   logstash-forwarder = callPackage ../tools/misc/logstash-forwarder { };
 
   kippo = callPackage ../servers/kippo { };